$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Random-ISAAC-XS.git /var/lib/mock/f45-build-24717-605/root/chroot_tmpdir/scmroot/perl-Math-Random-ISAAC-XS
Cloning into '/var/lib/mock/f45-build-24717-605/root/chroot_tmpdir/scmroot/perl-Math-Random-ISAAC-XS'...
$ git fetch origin 1c5eec8dc192e88eda42a6f2dda3b80fe4e2a64c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Random-ISAAC-XS
 * [new ref]         1c5eec8dc192e88eda42a6f2dda3b80fe4e2a64c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c5eec8 Perl 5.44 rebuild